LS2Ttype

iTrader: (9)

IS it worth porting a LS6 intake to ported LS1 heads?

When i put my motor together with my engine builder/machine shopp etc, nothing was talked about to port match My stock LS6 intake to my stock ported 241 heads ,

During dyno tuning my car hit a peak of 740 RWHP at 6,100 rpm @ 14 psi
then power droped while it we spun it up to 6,500 , it was still making boost peaked around 15.5 , power fell off around 20-25 HP , The first thing my tuner said was The stock intake that was the cause,

anyway if it can be done would it help to port my intake and open up the ports a bit for some better flow

98cherrySS

iTrader: (2)

Most will say no however there are small gains to be made. Maybe larger gains at your power level. Port match and throttle opening is about the limit of workable area.

Sales3@Texas-Speed

iTrader: (2)

Under boost I wouldn't do any porting on a GM LS6 intake as it would thin out the material and make potential weak spots that could break. I would save the money and step up to a FAST intake for more HP.

Lonnie

99Bluz28

iTrader: (35)

What cam are you running?

LS2Ttype

iTrader: (9)

Lonnie how much power would the New "Black" fast 92mm pick me up?

99Bluz28 im running a 215/230 Bolwer cam with .600 lift on a 117

99Bluz28

iTrader: (35)

What the ICL(advance) on the 215/230 117lsa cam..?
Just trying to get a good idea what you IVC (intake valve closing) is at .050" lift.

Tbird232ci

iTrader: (4)

You may be able to radius the leading edge of the ports at the head to reduce turbulence, but it would more likely end up being a placebo mod more than an actual benefit.

Sales3@Texas-Speed

iTrader: (2)

Conservatively, 15 -20 rwhp.

Lonnie

LS2Ttype

iTrader: (9)

99Bluz28 i think the specs were 216/231 with .610/580 on a 117 + 1 or 2, the cam is Thunder Racings cam that Geff spec out, His Engine Power systems now ans sells pretty much the same exact cam,

15-20 is Pretty good Lonnie! Two things, OK would my power band rise, right now it seems to Peak at 6,100 with the LS6 intake then drop,

Two,
do i really need a monster size throttle body? Right now i have a really nice 76mm Acufab TB on the stock LS6 intake and she took to the tune pretty well and i paid good money for her, Fast makes a adaptor plate so you can install a 3 bolt 75mm TB to the fast 4 bolt 92 intake

99Bluz28

iTrader: (35)

You'll still gain power going with the FAST92 intake with not changing the TB size, but you won't gain as much(5-10rwhp). Id still go with a larger Blower cam first (222-228 range on intake duration at .05" lift), Cam Motion, Tick performance, BTR, and CompCam, all either offer a good shelf (blower) cam, or can spec you a better cam that'll make more power, peak higher in the rpm range, and still idle fairly smooth (if wanted).

LS2Ttype

iTrader: (9)

That isnt happening 99Bluz28 , the cam stays in the camaro, I did go a little bigger in my LS2 T type Buick, shes a 87 White Turbo T with a LS2 conversion, 07 LS2 Vette motor ,drive by wire the works!, I cosidered the LS2 being a little bigger than the LS1 thats in the camaro and that the buick is running 1 7/8ths long tube headers and a duel
3" Exhaust , basically the cam is set up the same as the camaros but with 220/235 duration and same .600 lift i think shes on a 116 + 2 or so and installed straight up, altho im only looking for 600-650 to the wheels out of her, Buick being a auto with a 4L65E 600HP is all she needs

LS2Ttype

iTrader: (9)

Lingenfelter's Blower cam is only 215 intake "but" 245 exhaust, i guess its really for 6.2
LS3 motors , i hear the intake side of the LS3 heads flow great but not so much the exhaust, and for anything else more mild they are using factory LS9 211/230 cams

i realy dont think the Throttle body would make that much of a difference with Forced induction , the acufab i have is bored out smooth and is made to flow to the max for a 75mm TB,, The stock LS6 intake port design might be at its limmit at around 6,000-6,200 RPM with the over 700RWHP power im making etc , also i know my exhauts is a realy choke over 500HP so im lucky i made as much as i did,
I kinda have the same set up as a car that was in a GM HI-Tech issue back around 5 years , it was a Orange convertable from Cali, he peaked out at around 650 HP with pretty much the same set up as me, Then he upgraded his fuel system , installed a aluminum intake that looks like the stock LS1/LS6 intake but i forgot the name of the brand, and he did a true 3" duel exhaust, he put the car back on the dyno and pulled 810 horse to the wheels,which i thought was very impressive, i think he had his D1-sc maxed out at around 17 PSI

99Bluz28

iTrader: (35)

Just a suggestion to get the IVC up, so the power will peak at a higher rpm. So..., since a larger cam is out of the question have you considered retarding your current cam 3-4 degrees so the power will peak at a highter rpm?

LS2Ttype

iTrader: (9)

Geff said to install it straight up at the time, To be honest its only a street car, and i was only looking for a good dyno slip, at the time 740 was like holly ****, and it still is , but you know how it is you always want more , Carmin at the time when he Dyno tuned it for me back in the fall of 2009 said we can get 800 out of her, but he also said shes make a 100-150 horse more than what you need and shes very safe at 740 so Y barther, He never said we had to change anything like the exhaust or intake , it sounded like a little more boost and tweeking the tunning, Shes running at about a 11.5 A/F ratio with the meth system set about 50% and only 17 degs of timming, Most LS tunners are at 19-22 degs of timming on meth, But carmin was kinda new at tunning cars running methanol injection and i think he tuned her very Conservatively like she wasnt running methanol injection

LS2Ttype

iTrader: (9)

Im thinking there is 30-35 HP left in the tune and another 40-50 swapping out to the smaller 3.4 blower pulley , i have a 3.7 on her now and she makes 15psi , the 3.4 should pick up another 3psi, if i did the Fast intake Lonnie at Texas Speed is saying 15-20RWHP Conservatively but i would reuse my 75mm acufab TB so maybe it would only be worth 10RWHP , that comes to 820 to the wheels , pretty dame close to that Orange crush camaro that was in GM Hi-Tech mag , he made i think 810 but he had a true duel
3" exhaust , i dont but im running meth and he wasnt, the meth is worth 30HP min and more like 50 in the 700-800 HP range

99Bluz28

iTrader: (35)

As far as when the power peaks, I still think retarding your current cam or going with a larger cam is the best solution. Now as far as making more over power I have to say opening up the exhaust would probably bring the most gains without increasing boost.
I'd go with a either a Vibrant or FM 3"/4" Y-merger then into a 4" cat-back.

Keep me posted on what you end up changing and your results.
Good luck !

LS2Ttype

iTrader: (9)

Who makes a nice 4" cat back for our cars? , Who is Vibrant or FM?

99Bluz28

iTrader: (35)

Mufflex makes a 4" cat-back, the only down side I see is that they're aluminized steel not stainless steel, otherwise it's pretty good system. I've got a Mufflex 3.5" cat-back on my car with a Magnaflow muffler and a custom stainless steel shorty tail pipe, I'm happy with it.
https://ls1tech.com/forums/15807638-post25.html
http://i523.photobucket.com/albums/w...etrkrea003.jpg

Vibrant SS Y-pipe merger:
http://www.summitracing.com/parts/vpe-10362/overview/
Flowmaster (FM) Y-pipe merger:
http://www.summitracing.com/parts/flo-y300400/overview/

Here's the Vibrant merger I have on my Y-pipe.
https://ls1tech.com/forums/15079599-post1.html

LS2Ttype

iTrader: (9)

Looks Pretty good!, that Vibrant merger is real nice piece, But i think if i was to upgrade my exhaust i would just go with a true duel exhaust, But If there was a 4" single shott system with a 4" in and duel 3" out muffler one tail pipe on each side like my SLP duel/duel exit exhaust then i would very much consider it

My SlP SS muffler is i think a single 3" in and 2.5 out on each side with a split tail pipe on each side, I always wondered if i could still run a 3.5 or 4" single shott pipe from my Y pipe to the SLP muffler and have it tapered down to 3" so it would fit the muffler, not sure if doing that would restrict flow, My Car is a real SLP SS and came with the exhaust, i think a stock Z28 is a 2.75 main pipe and the SLP is a bit bigger, i think 3" it looks pretty beefy

99Bluz28

iTrader: (35)

Another option is to go with the Vibrant #10362 Y-merger then into a 4" E-cutout then into a 4" to 3" reducer right before the over-axle pipe. This way with the cut-out closed you still have your quiet slp muffler, but with the cut-out open you have the performance of a 4" cat-back exhaust. I would think at your current power level a 20-30 rwhp gain should be very possible with the cut-out open.